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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >To D or not to D? Re-evaluating particle-size distributions in natural and experimental fault rocks
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To D or not to D? Re-evaluating particle-size distributions in natural and experimental fault rocks

机译：到d或不d？ 在天然和实验故障岩石中重新评估粒度分布

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摘要

Cataclasis is a first-order mechanism shaping fault-rock development in the brittle crust. The most accepted model for cataclasis is "constrained comminution" which predicts a power-law distribution of particle size described by the fractal dimension, D. In this paper, we statistically test for the presence of power-law scaling in 61 naturally and experimentally deformed fault rocks, thereby assessing the validity of the constrained comminution model. We find that no data set exhibits compelling evidence for power-law scaling, even when a lower threshold is applied to promote the appearance of power-law scaling. Log-normal distributions provide better fits to statistically conclusive test cases, both when using a lower threshold (91% of cases) and when examining the full data sets. Thus, our results are not consistent with constrained comminution. We propose that log-normal distributions provide a more useful description of fault-rock particle-size distributions and discuss the implications for the mechanisms of cataclasis. (C) 2020 Elsevier B.V. All rights reserved.
机译：碎裂作用是形成脆性地壳中断层岩发育的一级机制。最被接受的碎裂模型是“约束粉碎”，它预测了由分形维数D描述的粒度幂律分布。在本文中，我们统计测试了61个自然变形和实验变形断层岩石中的幂律标度，从而评估了约束粉碎模型的有效性。我们发现，没有数据集显示出令人信服的幂律标度证据，即使采用较低的阈值来促进幂律标度的出现。在使用较低的阈值（91%的病例）和检查完整数据集时，对数正态分布能更好地拟合统计结论性测试病例。因此，我们的结果与限制粉碎不一致。我们认为对数正态分布提供了断层岩石粒度分布的更有用的描述，并讨论了对碎裂机制的影响。（C） 2020爱思唯尔B.V.版权所有。

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